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Internal diameter measuring method for transparent tube

a technology of transparent tubes and measuring methods, applied in the direction of measuring devices, instruments, using optical means, etc., can solve problems such as unavoidable errors, and achieve the effect of accurate measurement, avoiding fluctuations, and reducing errors

Active Publication Date: 2018-08-28
MITUTOYO CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an accurate method of measuring the internal diameter of a transparent tube using a parallel laser light beam. The method detects the position of the light beam reflected by the inner surface of the tube and calculates the position of the midpoint, which accurately represents the position of the inner surface. This allows for the accurate measurement of the internal diameter of the tube. The method can be used on both sides of the tube for added accuracy. Overall, the invention provides a reliable and precise means of measuring the internal diameter of transparent tubes.

Problems solved by technology

Because of this, errors are unavoidable when detecting the positions (P5 and P6) exceeding the threshold value T.

Method used

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  • Internal diameter measuring method for transparent tube
  • Internal diameter measuring method for transparent tube
  • Internal diameter measuring method for transparent tube

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Embodiment Construction

[0031]The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the forms of the present invention may be embodied in practice.

[0032]Hereafter, an embodiment of the present invention is described based on FIGS. 1 to 3. In FIG. 1, a measuring apparatus 1 is a device measuring an outer dimension of a measured object (a transparent tube 50) using a parallel laser light beam. In the present embodiment, a laser scanning micrometer is used for the measuring ap...

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Abstract

A transparent tube is placed in a parallel laser light beam emitted from a light projector and reaching a photoreciever, and a detection signal indicating an amount of light received corresponding to a width direction position of the parallel laser light beam is obtained from the photoreceiver. Peaks formed in the detection signal by beams reflected by an inner circumferential surface of the transparent tube and incident to the photoreceiver are detected; width direction positions of two intersection points where the peaks cross a predetermined threshold value are detected; the width direction positions of the light beam reflected by the inner circumferential surface of the transparent tube are calculated from an average value of the two intersection points; and an internal diameter of the transparent tube is measured from the width direction positions.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority under 35 U.S.C. § 119 of Japanese Application No. 2015-244245, filed on Dec. 15, 2015, the disclosure of which is expressly incorporated by reference herein in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an internal diameter measuring method for a transparent tube.[0004]2. Description of Related Art[0005]Optical measuring apparatuses are used in order to conduct non-contact measurement of an external dimension of a measured object (such as an outer diameter of a cylindrical object). For example, a laser scan micrometer, image sensor micrometer, or light-section type 2D (two dimensional) shape measuring sensor is used. These apparatuses detect the outer diameter and the like of the measured object from measurements of shaded sections blocked by the measured object, using a plurality of parallel laser light beams arranged in a band shap...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G01B11/02G01B11/12G01B11/24
CPCG01B11/2433G01B11/12
Inventor IMAIZUMI, RYOICHI
Owner MITUTOYO CORP
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